CN103491547B

CN103491547B - A kind of frequency spectrum switching method based on cognitive radio system and equipment

Info

Publication number: CN103491547B
Application number: CN201210194003.4A
Authority: CN
Inventors: 白文岭; 蒋成钢; 李媛媛; 杨宇
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2012-06-13
Filing date: 2012-06-13
Publication date: 2016-12-07
Anticipated expiration: 2032-06-13
Also published as: WO2013185564A1; CN103491547A

Abstract

The invention discloses a kind of frequency spectrum switching method based on cognitive radio system and equipment, the method includes: before frequency spectrum switches, and base station equipment and terminal unit maintain uplink synchronous in the working frequency points of source；When base station equipment is after target operation frequency recovers community, base station equipment receives the ascending resource application from terminal unit on target operation frequency, ascending resource application is used for applying for ascending resource, and ascending resource is for making terminal unit send for indicating terminal unit to be successfully completed the frequency spectrum handoff completion message of frequency spectrum handoff procedure；Base station equipment distributes ascending resource for terminal unit on target operation frequency, and on target operation frequency, the ascending resource of distribution is sent to terminal unit.In the embodiment of the present invention, reduce frequency spectrum handoff failure probability and the service outage duration of CR system, improve the Consumer's Experience of CR system.

Description

Spectrum switching method and device based on cognitive radio system

Technical Field

The invention relates to the technical field of communication, in particular to a frequency spectrum switching method and device based on a cognitive radio system.

Background

Radio communication spectrum is a precious natural resource, the problem of poor spectrum resource is increasingly serious with the rapid development of radio communication technology, in order to alleviate the current situation of spectrum resource shortage, related departments and organizations monitor and research the radio communication spectrum, and find that some frequency bands (such as television frequency bands) are not used in most of time or are not used in most of regions, and some frequency bands have the situation of multi-system and multi-user simultaneous competition, namely the use of the spectrum resource has an imbalance phenomenon.

The CR (Cognitive Radio) concept is generated in this context, and its basic idea is: on the premise of not causing interference to an authorization system, the CR system can dynamically and opportunistically access the white space for communication by monitoring the change of the current wireless environment; when a CR system opportunistically accesses the white space of an authorized system, it is premised on protecting the authorized system traffic from harmful interference from the CR system, which requires: (1) the CR system has the capability of determining the white space spectrum, namely, the white space spectrum of the authorized system frequency band is accurately judged; (2) the CR system has spectrum switching capability, namely when the CR system finds that the authorization system reappears on the currently used white space spectrum (source working frequency point) or the quality of the currently used white space spectrum does not meet the service quality requirement of the CR system, the CR system can quit the currently used white space spectrum in time.

As shown in fig. 1, a flowchart is shown for implementing spectrum handover in a CR system, and through the implementation flow, continuity of a CR system service can be ensured; specifically, when the frequency spectrum is switched, the whole CR system can be switched to other white space frequency spectrums (target working frequency points) to recover the service after exiting from the source working frequency point.

In the prior art, the frequency spectrum switching process is designed based on a static authorized frequency band, and the number of switched terminal devices is generally small for switching scenes among different cells, and the basic process is as follows: the base station equipment sends a frequency spectrum switching command to the terminal equipment and informs the terminal equipment of a target working frequency point and wireless resource allocation thereof; after receiving the frequency spectrum switching command, the terminal equipment leaves the source working frequency point, searches the target working frequency point, executes random access on the target working frequency point after searching the target frequency point, completes uplink synchronization with the base station equipment through the random access process, and sends a frequency spectrum switching completion message to the base station equipment.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

in the spectrum switching process of the CR system, all RRC (Radio resource control) connected terminal devices in the whole cell need to be switched to a target working frequency point, and many RRC connected terminal devices (which may be more than 1200) are needed, so that by using the existing spectrum switching manner, a large number of terminal devices are concentrated on the target working frequency point in a short time to perform a contention random access process, resulting in a high random access failure probability and a high random access delay, thereby resulting in a high spectrum switching failure probability and a high service interruption time, and affecting user experience of the CR system.

The embodiment of the invention provides a frequency spectrum switching method and device based on a cognitive radio system, which are used for reducing the frequency spectrum switching failure probability and the service interruption time and improving the user experience of a CR system.

In order to achieve the above object, an embodiment of the present invention provides a method for switching frequency spectrums based on a cognitive radio system, where before the frequency spectrums are switched, a base station device and a terminal device maintain uplink synchronization at a source working frequency point; the method comprises the following steps:

after the base station equipment recovers the cell at the target working frequency point, the base station equipment receives an uplink resource application from the terminal equipment at the target working frequency point, wherein the uplink resource application is used for applying for uplink resources, and the uplink resources are used for enabling the terminal equipment to send a frequency spectrum switching completion message for indicating that the terminal equipment has successfully completed a frequency spectrum switching process;

and the base station equipment allocates uplink resources for the terminal equipment on the target working frequency point and sends the allocated uplink resources to the terminal equipment on the target working frequency point.

The embodiment of the invention provides a frequency spectrum switching method based on a cognitive radio system, wherein before frequency spectrum switching, a terminal device and a base station device maintain uplink synchronization on a source working frequency point; the method comprises the following steps:

after searching the target working frequency point, the terminal equipment judges whether uplink synchronization is maintained between the terminal equipment and the base station equipment;

if so, the terminal equipment sends an uplink resource application to the base station equipment by using a sending mode and resources of the uplink resource application, wherein the uplink resource application is used for applying for uplink resources, and the uplink resources are used for enabling the terminal equipment to send a frequency spectrum switching completion message;

and the terminal equipment receives uplink resources distributed to the terminal equipment by the base station equipment on the target working frequency point, and sends a frequency spectrum switching completion message for indicating that the terminal equipment successfully completes the frequency spectrum switching process to the base station equipment by utilizing the uplink resources.

An embodiment of the present invention provides a base station device, including:

the management module is used for maintaining the uplink synchronization of the base station equipment and the terminal equipment on the source working frequency point before the frequency spectrum switching;

a receiving module, configured to receive, at a target working frequency point, an uplink resource application from a terminal device after a cell is restored at the target working frequency point, where the uplink resource application is used to apply for an uplink resource, and the uplink resource is used to enable the terminal device to send a spectrum handover completion message used to indicate that the terminal device has successfully completed a spectrum handover process;

the allocation module is used for allocating uplink resources to the terminal equipment on the target working frequency point;

and the sending module is used for sending the allocated uplink resources to the terminal equipment on the target working frequency point.

An embodiment of the present invention provides a terminal device, including:

the management module is used for maintaining uplink synchronization between the terminal equipment and the base station equipment on a source working frequency point before spectrum switching;

the judging module is used for judging whether uplink synchronization is maintained between the terminal equipment and the base station equipment after the target working frequency point is searched;

a first sending module, configured to send an uplink resource application to the base station device by using a sending method and resources of the uplink resource application when a determination result is yes, where the uplink resource application is used to apply for an uplink resource, and the uplink resource is used to enable the terminal device to send a spectrum handover completion message;

a receiving module, configured to receive, at a target working frequency point, an uplink resource allocated to the terminal device by the base station device at the target working frequency point;

a second sending module, configured to send, to the base station device by using the uplink resource, a spectrum handover completion message used for indicating that the terminal device has successfully completed a spectrum handover process.

Compared with the prior art, the embodiment of the invention at least has the following advantages: in the embodiment of the invention, in the frequency spectrum switching process, the base station equipment can allocate uplink resources to the terminal equipment on the target working frequency point after receiving the uplink resource application of the terminal equipment, and trigger the terminal equipment to send the frequency spectrum switching completion message, so that the random access process is omitted in the frequency spectrum switching process, the random access conflict in the frequency spectrum switching process of the CR system is avoided, the frequency spectrum switching failure probability and the service interruption time of the CR system are reduced, and the user experience of the CR system is improved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a spectrum handover implementation in a CR system according to the prior art;

fig. 2 is a schematic flowchart of a spectrum handover method based on a cognitive radio system according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a spectrum handover method based on a cognitive radio system according to a second embodiment of the present invention;

fig. 4 is a schematic flowchart of a spectrum handover method based on a cognitive radio system according to a third embodiment of the present invention;

fig. 5 is a schematic flowchart of a spectrum handover method based on a cognitive radio system according to a fourth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a base station device according to a fifth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a terminal device according to a sixth embodiment of the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The embodiment of the invention provides a frequency spectrum switching method based on a cognitive radio system, and the application scenes of the method include but are not limited to: long Term Evolution (LTE), time Division-Synchronous Code Division Multiple Access (TD-SCDMA), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), or Code Division Multiple Access (CDMA) -2000 wireless communication systems using CR technology; as shown in fig. 2, the method comprises the steps of:

step 201, before the spectrum switching, the base station device (the base station device in the CR system) and the terminal device (the terminal device in the CR system) maintain uplink synchronization on the source working frequency point.

In a preferred embodiment of the present invention, in order to maintain uplink synchronization between the base station device and the terminal device at the source operating frequency point, the following steps are performed: the base station equipment determines whether the terminal equipment and the base station equipment maintain uplink synchronization on a source working frequency point by detecting an uplink signal sent by the terminal equipment; if the synchronization deviation exists, the base station equipment sends a timing adjustment command to the terminal equipment so as to indicate that the terminal equipment needs to adjust an uplink timing synchronization point through the timing adjustment command; and: when receiving a timing adjustment command from the base station equipment, the terminal equipment adjusts an uplink timing synchronization point, namely adjusts the timing synchronization of an uplink channel/signal in uplink transmission; after the base station device and the terminal device perform the above processing, the base station device and the terminal device can maintain uplink synchronization at the source working frequency point.

Step 202, before spectrum switching, a base station device and a terminal device agree in advance on a sending mode and resources of an uplink resource application; the uplink resource application is used for applying for uplink resources (such as time-frequency codes and other resources), and the uplink resources are used for enabling the terminal equipment to send a spectrum switching completion message; it should be noted that the uplink resource application is orthogonal and collision-free between the terminal equipments in the cell.

The base station device and the terminal device pre-agree on the sending mode and resource of the uplink resource application, including but not limited to: the base station equipment and the terminal equipment statically stipulate the sending mode and the resource of the uplink resource application through a protocol; or, the base station device and the terminal device agree on the sending mode and resource of the uplink resource application in a dynamic configuration mode, that is, the base station device configures the sending mode and resource of the uplink resource application for the terminal device, and notifies the sending mode and resource of the uplink resource application to the terminal device; for example, the base station device notifies the terminal device of the sending method and resource of the uplink resource application through an air interface message such as a dedicated signaling or a system broadcast message.

It should be noted that there is no precedence relationship between step 201 and step 202, step 202 may also be executed before step 201, and step 202 is an optional step.

Step 203, when the base station device finds that the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, the base station device decides that a frequency spectrum switching process needs to be executed, generates a frequency spectrum switching command and sends the frequency spectrum switching command to the terminal device; the frequency spectrum switching command at least comprises target working frequency points and/or wireless resource configuration information.

In a preferred implementation manner of the embodiment of the present invention, the spectrum switching command may further carry indication information indicating whether uplink synchronization is maintained between the base station device and the terminal device; and the determining mode whether to maintain uplink synchronization between the base station equipment and the terminal equipment comprises the following steps: the base station equipment judges whether the time length between the time when the terminal equipment sends the uplink resource application and the time when the timing adjustment command is sent for the last time does not exceed a specified time threshold (can be set according to actual experience), and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold (can be set according to actual experience); if so, the base station equipment determines that the uplink synchronization is maintained between the base station equipment and the terminal equipment; if not, the base station equipment determines that the uplink synchronization between the base station equipment and the terminal equipment is not maintained.

In a preferred implementation manner of the embodiment of the present invention, the spectrum switching command may further carry a sending manner and resources of an uplink resource application, and an obtaining manner of the spectrum switching command may be configured for the base station device to be the terminal device.

It should be noted that, since step 202 is an optional step, if step 202 is executed in practical application, the spectrum handover command may carry the sending method and resource of the uplink resource application, or may not carry the sending method and resource of the uplink resource application; in practical applications, if step 202 is not executed, the spectrum switching command needs to carry the sending mode and resource of the uplink resource application.

And step 204, after the base station equipment sends the spectrum switching command to the terminal equipment, stopping signal transceiving at the source working frequency point.

In step 205, after the base station device stops receiving and transmitting signals at the source working frequency point, the cell is recovered by using the target working frequency point.

Step 206, after the terminal device receives the spectrum switching command, if the spectrum switching command carries the sending method and resource of the uplink resource application, the terminal device needs to store or update the sending method and resource of the uplink resource application (i.e. if there is no sending method and resource of the uplink resource application, the sending method and resource of the uplink resource application are directly stored, and if there is a sending method and resource of the uplink resource application, the sending method and resource of the uplink resource application that exists currently are updated).

Step 207, after receiving the spectrum switching command, the terminal device leaves the source working frequency point, and executes downlink synchronization with the base station device on the target working frequency point, that is, searches the target working frequency point.

It should be noted that there is no precedence relationship between step 206 and step 207, and step 207 may also be executed before step 206; step 206 and step 207 have no precedence relationship with step 204 and step 205, for example, step 207 may be located before step 204, or may be located before step 205, and step 206 may be located before step 204, or may be located before step 205.

Step 208, after searching the target working frequency point, the terminal equipment judges whether uplink synchronization is maintained between itself and the base station equipment; if so, go to step 209; if not, the uplink synchronization fails, and at this time, the existing spectrum switching mode needs to be adopted, which is not described again.

In the embodiment of the present invention, the terminal device determines whether uplink synchronization is maintained between itself and the base station device at the target working frequency point, including but not limited to the following modes:

the method comprises the steps that a terminal device judges whether the time length between the current time or the time when the terminal device sends an uplink resource application and the time when the uplink timing synchronization point is adjusted at the latest time does not exceed a specified time threshold (set according to practical experience and can be the same as a specified time threshold value adopted by a base station device), and whether the central frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold (set according to practical experience and can be the same as a specified frequency threshold value adopted by the base station device); if so, the terminal equipment determines that the uplink synchronization is maintained between the terminal equipment and the base station equipment; if not, the terminal equipment determines that the uplink synchronization between the terminal equipment and the base station equipment is not maintained.

And secondly, when the frequency spectrum switching command carries indication information of whether the uplink synchronization between the base station equipment and the terminal equipment is maintained, the terminal equipment obtains the indication information of whether the uplink synchronization is maintained between the base station equipment and the terminal equipment from the frequency spectrum switching command from the base station equipment, and determines whether the uplink synchronization is maintained or not maintained between the terminal equipment and the base station equipment by using the indication information.

Step 209, the terminal device sends an uplink resource application to the base station device by using the sending mode and resource of the uplink resource application, where the uplink resource application is used to apply for the uplink resource, and the uplink resource is used to enable the terminal device to send a spectrum handover completion message for indicating that the terminal device has successfully completed the spectrum handover process.

In the embodiment of the present invention, the sending method and resource of the uplink resource application are previously stored, and the method for the terminal device to obtain the sending method and resource of the uplink resource application includes, but is not limited to: the method comprises the steps that a terminal device and a base station device agree in advance on a sending mode and resources of an uplink resource application; or the terminal equipment obtains the sending mode and the resource of the uplink resource application from the frequency spectrum switching command; in the appointment process, the terminal equipment and the base station equipment statically stipulate the sending mode and the resource of the uplink resource application through a protocol; or, the terminal device receives the sending mode and resource of the uplink resource application from the base station device through an air interface message such as a dedicated signaling or a system broadcast message.

In the embodiment of the invention, in the process that the base station equipment and the terminal equipment agree the sending mode and the resource of the uplink resource application in advance, the terminal equipment and the base station equipment can also agree the maximum sending times of the uplink resource application in advance; and the terminal equipment sending the uplink resource application to the base station equipment comprises: the terminal equipment sends the uplink resource application to the base station equipment for multiple times by using the sending mode and the resources of the uplink resource application until the terminal equipment receives the uplink resources distributed for the terminal equipment by the base station equipment on the target working frequency point or the maximum sending times is reached; and if the uplink resource allocated to the terminal equipment by the base station equipment on the target working frequency point is not received after the number of times of applying for the transmission of the uplink resource reaches the maximum number of times of transmitting, adopting the existing frequency spectrum switching mode.

Step 210, after the base station device recovers the cell at the target working frequency point, the base station device receives the uplink resource application from the terminal device at the target working frequency point, allocates the uplink resource for the terminal device at the target working frequency point, and sends the allocated uplink resource to the terminal device at the target working frequency point.

In a preferred implementation manner of the embodiment of the present invention, the base station device may further allocate an uplink transmission manner to the terminal device at the target working frequency point, and transmit the allocated uplink transmission manner to the terminal device at the target working frequency point. The uplink transmission mode includes, but is not limited to: modulation and coding scheme, HARQ (Hybrid automatic Repeat request) information, power control information, and the like.

Step 211, the terminal device receives, at the target working frequency point, the uplink resource allocated to the terminal device by the base station device at the target working frequency point, and sends, to the base station device, a spectrum handover completion message for indicating that the terminal device has successfully completed the spectrum handover process by using the uplink resource.

In a preferred implementation manner of the embodiment of the present invention, the base station device may further allocate an uplink transmission manner to the terminal device at the target working frequency point, and transmit the allocated uplink transmission manner to the terminal device at the target working frequency point; based on the above, the terminal device receives the uplink transmission mode allocated by the base station device for the terminal device on the target working frequency point, and transmits a spectrum switching completion message to the base station device by using the uplink resource and the uplink transmission mode.

In summary, in the embodiment of the present invention, in the spectrum switching process, after receiving an uplink resource application from a terminal device, a base station device may allocate an uplink resource (an uplink resource without conflict between terminal devices in a cell) to the terminal device at a target working frequency point, that is, the terminal device is triggered to send a spectrum switching completion message by using a pre-agreed resource application manner and resource without conflict between terminal devices in the cell, so as to omit a random access process in the spectrum switching process, avoid a random access conflict in the spectrum switching process of a CR system, reduce a spectrum switching failure probability and a service interruption time of the CR system, and improve user experience of the CR system.

Example two

The second embodiment of the invention provides a frequency spectrum switching method based on a cognitive radio system, which is used for explaining the processing of base station equipment in detail; as shown in fig. 3, the method comprises the steps of:

step 301, before the spectrum switching, the base station device (the base station device in the CR system) maintains uplink synchronization with the terminal device (the terminal device in the CR system) at the source working frequency point.

In a preferred implementation manner of the embodiment of the present invention, a base station device determines whether a terminal device and the base station device maintain uplink synchronization at a source working frequency point by detecting an uplink signal sent by the terminal device; and if the synchronization deviation exists, the base station equipment sends a timing adjustment command to the terminal equipment so as to indicate that the terminal equipment needs to adjust an uplink timing synchronization point through the timing adjustment command, so that the base station equipment is ensured to maintain the uplink synchronization with the terminal equipment on the source working frequency point.

Step 302, before spectrum switching, a base station device and a terminal device agree in advance on a sending mode and resources of an uplink resource application; the uplink resource application is used for applying for uplink resources, and the uplink resources are used for enabling the terminal equipment to send a frequency spectrum switching completion message; it should be noted that the uplink resource application is orthogonal and collision-free between the terminal equipments in the cell.

In addition, in the process that the base station device and the terminal device agree in advance on the transmission mode and the resource of the uplink resource application, the terminal device and the base station device may also agree in advance on the maximum transmission times of the uplink resource application.

Step 303, when the base station device finds that the authorized user reappears at the source working frequency point (current working frequency point) or the channel quality of the source working frequency point is reduced, the base station device decides that a spectrum switching process needs to be executed, generates a spectrum switching command, and sends the spectrum switching command to the terminal device; the frequency spectrum switching command at least comprises target working frequency points and/or wireless resource configuration information.

In a preferred implementation manner of the embodiment of the present invention, the spectrum switching command may further carry indication information indicating whether uplink synchronization is maintained between the base station device and the terminal device; and the determining method of whether to maintain uplink synchronization between the base station device and the terminal device includes, but is not limited to: the base station equipment judges whether the time length between the time when the terminal equipment sends the uplink resource application and the time when the timing adjustment command is sent for the last time does not exceed a specified time threshold (can be set according to actual experience), and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold (can be set according to actual experience); if so, the base station equipment determines that the uplink synchronization is maintained between the base station equipment and the terminal equipment; if not, the base station equipment determines that the uplink synchronization between the base station equipment and the terminal equipment is not maintained.

And step 304, after the base station equipment sends the spectrum switching command to the terminal equipment, stopping signal transceiving at the source working frequency point.

Step 305, after the base station equipment stops the signal transceiving at the source working frequency point, the cell is recovered by using the target working frequency point.

Step 306, the base station device receives an uplink resource application from the terminal device.

Step 307, after receiving the uplink resource application, the base station device allocates uplink resources and uplink transmission modes to the terminal device at the target working frequency point (taking the case of allocating uplink resources and uplink transmission modes at the same time as an example for explanation), and transmits the allocated uplink resources and uplink transmission modes to the terminal device.

Step 308, the base station device receives the spectrum handover complete message sent by the terminal device, and confirms that the terminal device has completed the spectrum handover process.

EXAMPLE III

The third embodiment of the invention provides a frequency spectrum switching method based on a cognitive radio system, which is used for explaining the processing of terminal equipment in detail; as shown in fig. 4, the method comprises the steps of:

in step 401, before the spectrum switching, the terminal device (terminal device in the CR system) maintains uplink synchronization with the base station device (base station device in the CR system) at the source working frequency point.

In a preferred implementation manner of the embodiment of the present invention, the terminal device detects a timing adjustment command issued by the base station device, and adjusts the uplink timing synchronization point according to the timing adjustment command, that is, adjusts the timing synchronization of the uplink channel/signal in the uplink transmission of the terminal device, so as to ensure that the terminal device maintains the uplink synchronization with the base station device at the source operating frequency point.

Step 402, before switching frequency spectrum, the terminal device and the base station device agree in advance on the sending mode and resource of the uplink resource application; the uplink resource application is used for applying for uplink resources, and the uplink resources are used for enabling the terminal equipment to send a frequency spectrum switching completion message; it should be noted that the uplink resource application is orthogonal and collision-free between the terminal equipments in the cell.

In the embodiment of the present invention, the terminal device and the base station device agree in advance on the transmission mode and resource of the uplink resource application, including but not limited to: the terminal equipment and the base station equipment statically stipulate the sending mode and the resource of the uplink resource application through a protocol; or, the terminal device receives the sending mode and resource of the uplink resource application from the base station device through an air interface message such as a dedicated signaling or a system broadcast message.

In addition, in the process that the terminal device and the base station device agree in advance on the transmission mode and the resource of the uplink resource application, the terminal device and the base station device may also agree in advance on the maximum transmission times of the uplink resource application.

Step 403, the terminal device receives a spectrum switching command from the base station device; wherein, the frequency spectrum switching command at least comprises target working frequency point and/or wireless resource configuration information; in an optional implementation manner of the embodiment of the present invention, the spectrum switching command may further carry indication information indicating whether uplink synchronization is maintained between the base station device and the terminal device; in an optional implementation manner of the embodiment of the present invention, the spectrum switching command may further carry a sending manner and resources of an uplink resource application.

Step 404, after the terminal device receives the spectrum switching command, if the spectrum switching command carries the sending mode and resource of the uplink resource application, the terminal device needs to store or update the sending mode and resource of the uplink resource application, and execute step 405; otherwise, step 405 is performed directly.

Step 405, after receiving the spectrum switching command, the terminal device leaves the source working frequency point, and executes downlink synchronization with the base station device on the target working frequency point, that is, searches the target working frequency point.

Step 406, the terminal device sets 0 to the number of times of sending the uplink resource application.

Step 407, after searching the target working frequency point, the terminal device determines whether uplink synchronization is maintained between itself and the base station device; if so, go to step 408; if not, the uplink synchronization fails, and at this time, the existing spectrum switching mode needs to be adopted, which is not described again.

the method comprises the steps that firstly, a terminal device judges whether the time length between the current time or the time when the terminal device sends an uplink resource application and the time when the terminal device last carries out uplink timing synchronization point adjustment does not exceed a specified time threshold (set according to actual experience), and whether the central frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold (set according to actual experience); if so, the terminal equipment determines that the uplink synchronization is maintained between the terminal equipment and the base station equipment; if not, the terminal equipment determines that the uplink synchronization between the terminal equipment and the base station equipment is not maintained.

And step 408, the terminal equipment sends the uplink resource application to the base station equipment by using the sending mode and the resource of the uplink resource application stored by the terminal equipment, and adds 1 to the sending frequency of the uplink resource application.

Step 409, the terminal device detects whether the uplink resource and the uplink transmission mode allocated to the terminal device by the base station device are received (the uplink resource and the uplink transmission mode are detected at the same time for the description); if yes, go to step 410; otherwise, step 411 is executed.

In step 410, the terminal device sends a spectrum handover complete message for indicating that the terminal device has successfully completed the spectrum handover process to the base station device by using the allocated uplink resource and uplink sending mode.

Step 411, the terminal device determines whether the number of sending uplink resource application reaches the maximum number of sending uplink resource application; if not, step 407 is executed, and if so, the existing spectrum switching mode is adopted.

Example four

In a fourth embodiment of the present invention, a method for spectrum switching based on a cognitive radio system is provided, where an LTE system is taken as an example, the method implements a spectrum switching process in which a base station device in the LTE-CR system triggers a terminal device to send a spectrum switching completion message, and in the application scenario, the base station device is an eNode B and the terminal device is a UE (User Equipment); it should be noted that, for other application scenarios to which the spectrum switching method is applicable, such as TD-SCDMA, WCDMA and other wireless communication systems, corresponding processing is similar to that of the LTE system, and will not be described in detail later; as shown in fig. 5, the method for switching frequency spectrum in the LTE system includes the following steps:

step 501, before switching frequency spectrums, an eNode B (eNode B in LTE-CR system) and a UE (UE in LTE-CR system) maintain uplink synchronization on a source working frequency point.

In a preferred embodiment of the present invention, in order to maintain uplink synchronization between an eNode B and a UE at a source operating frequency point, the following steps are performed: the eNode B determines whether the UE and the eNode B maintain uplink synchronization on a source working frequency point by detecting an uplink signal sent by the UE; if the synchronization deviation exists, the eNode B sends a TAC (Timing Advanced Command) to the UE so as to indicate that the UE needs to adjust the uplink Timing synchronization point through the TAC;

and: when receiving the TAC from the eNode B, the UE adjusts an Uplink timing synchronization point, that is, adjusts timing synchronization of an Uplink Channel/Signal in Uplink transmission, for example, adjusts timing synchronization of a PUSCH (Physical Uplink shared Channel), a PUCCH (Physical Uplink Control Channel), an SRS (Sounding Reference Signal), and the like in Uplink transmission;

therefore, after the eNode B and the UE perform the processing, the eNode B and the UE can maintain uplink synchronization on the source working frequency point.

Step 502, the eNode B and the UE statically specify through a protocol: an SR (Schedule Request, scheduling Request) is used for applying for uplink resources, that is, a transmission mode of the uplink resource application specifically includes: and sending an uplink resource application through the scheduling request SR. .

In this step, in the process of the eNode B and the UE agreeing to apply for the uplink resource, the method may further include: the maximum number of transmissions of the SR is agreed.

Step 503, when the eNode B finds that the authorized user reappears at the source working frequency point or the channel quality of the source working frequency point is reduced, the eNode B decides that the spectrum switching process needs to be executed, generates a spectrum switching command, and sends the spectrum switching command to the UE; the frequency spectrum switching command at least comprises target working frequency points and/or wireless resource configuration information.

In a preferred implementation manner of the embodiment of the present invention, the spectrum handover command may further carry indication information indicating whether uplink synchronization is maintained between the eNode B and the UE; and the determining mode of whether the uplink synchronization is maintained between the eNode B and the UE comprises the following steps: the eNode B judges whether the time length between the time when the UE sends the uplink resource application and the time when the UE sends the timing adjustment command for the last time does not exceed a specified time threshold, and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold; if so, the eNode B determines that the uplink synchronization is maintained between the eNode B and the UE; if not, the eNode B determines that uplink synchronization is not maintained between the eNode B and the UE.

In a preferred implementation manner of the embodiment of the present invention, the spectrum handover command may also carry an updated SR configuration.

In step 504, after the eNode B sends the spectrum switching command to the UE, it stops transmitting and receiving signals at the source operating frequency point.

In step 505, after the eNode B stops transmitting and receiving signals at the source operating frequency, the eNode B recovers the cell using the target operating frequency.

In step 506, after receiving the spectrum handover command, if the spectrum handover command includes the updated SR configuration, the UE updates its SR configuration.

In step 507, after receiving the frequency spectrum switching command, the UE leaves the source working frequency point and performs downlink synchronization with the eNode B on the target working frequency point, that is, searches for the target working frequency point.

Step 508, after searching the target working frequency point, the UE determines whether to maintain uplink synchronization with the eNode B; if so, go to step 209; if not, the uplink synchronization fails, and at this time, the existing spectrum switching mode needs to be adopted, which is not described again.

In the embodiment of the present invention, the UE determines whether uplink synchronization is maintained between itself and the eNode B at the target operating frequency point, including but not limited to the following modes:

the method comprises the steps that firstly, whether the time length between the current time of UE or the time of judging the time of sending an uplink resource application by the UE and the time of carrying out uplink timing synchronization point adjustment at the latest time does not exceed a specified time threshold or not, and whether the central frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold or not; if so, the UE determines to maintain uplink synchronization between the UE and the eNode B; if not, the UE determines that uplink synchronization is not maintained between the UE and the eNode B.

And secondly, when the indication information of whether the uplink synchronization is maintained between the eNode B and the UE is carried in the frequency spectrum switching command, the UE obtains the indication information of whether the uplink synchronization is maintained between the eNode B and the UE from the frequency spectrum switching command from the eNode B, and determines whether the uplink synchronization is maintained between the UE and the eNode B or not by using the indication information.

In step 509, the UE transmits the SR using the stored SR configuration.

It should be noted that, based on the agreed maximum number of SR transmission times, the UE may also transmit the SR multiple times until successfully applying for uplink resources for transmitting the spectrum handover completion message or reaching the maximum number of SR transmission times, and if the UE does not receive the uplink resources after reaching the maximum number of SR transmission times, the existing spectrum handover method is adopted.

In step 510, the eNode B receives the SR from the UE, allocates uplink resources and an uplink transmission scheme to the UE (for example, the uplink resources and the uplink transmission scheme are simultaneously allocated), and transmits the allocated uplink resources and the uplink transmission scheme to the UE.

In the embodiment of the invention, the eNode B can send the allocated uplink resources to the UE on the target working frequency point through a Physical Downlink Control Channel (PDCCH).

In step 511, the UE sends a spectrum handover complete message to the eNode B by using the allocated uplink resources and uplink sending manner, and notifies the eNode B that it successfully completes the spectrum handover process.

EXAMPLE five

Based on the same inventive concept as the above method, an embodiment of the present invention further provides a base station apparatus, as shown in fig. 6, where the base station apparatus includes:

the management module 11 is configured to maintain uplink synchronization between the base station device and the terminal device at a source working frequency point before spectrum switching;

a receiving module 12, configured to receive, at a target working frequency point, an uplink resource application from the terminal device after the base station device recovers a cell at the target working frequency point, where the uplink resource application is used to apply for an uplink resource, and the uplink resource is used to enable the terminal device to send a spectrum handover completion message used to indicate that the terminal device has successfully completed a spectrum handover process;

the allocation module 13 is configured to allocate uplink resources to the terminal device on a target working frequency point;

and a sending module 14, configured to send the allocated uplink resource to the terminal device on a target working frequency point.

The management module 11 is further configured to, before spectrum switching, agree in advance with the terminal device about a transmission method and resource for an uplink resource application.

The allocation module 13 is further configured to allocate an uplink transmission mode to the terminal device on the target working frequency point;

the sending module 14 is further configured to send the allocated uplink sending mode to the terminal device on a target working frequency point.

The management module 11 is further configured to statically specify, with the terminal device, a sending method and resources of the uplink resource application through a protocol; or configuring the sending mode and the resource of the uplink resource application for the terminal equipment, and informing the sending mode and the resource of the uplink resource application to the terminal equipment.

The management module 11 is further configured to generate a spectrum switching command when an authorized user reappears at the source working frequency point or the channel quality of the source working frequency point is reduced, and send the spectrum switching command to the terminal device; the frequency spectrum switching command comprises a target working frequency point and/or wireless resource configuration information, and a sending mode and resources of the uplink resource application.

In a long term evolution LTE system, the sending method of the uplink resource application specifically includes: and sending the uplink resource application through a scheduling request SR.

The management module 11 is further configured to generate a spectrum switching command when an authorized user reappears at the source working frequency point or the channel quality of the source working frequency point is reduced, and send the spectrum switching command to the terminal device; the frequency spectrum switching command comprises target working frequency points and/or wireless resource configuration information and indication information of whether uplink synchronization is maintained between the base station equipment and the terminal equipment.

The management module 11 is further configured to determine whether uplink synchronization is maintained between the base station device and the terminal device by: judging whether the time length between the time when the terminal equipment sends the uplink resource application and the time when the terminal equipment sends the timing adjustment command for the last time does not exceed a specified time threshold or not, and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold or not; if so, determining that the uplink synchronization is maintained between the base station equipment and the terminal equipment; and if not, determining that the uplink synchronization between the base station equipment and the terminal equipment is not maintained.

The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.

EXAMPLE six

Based on the same inventive concept as the above method, an embodiment of the present invention further provides a terminal device, as shown in fig. 7, where the terminal device includes:

a management module 21, configured to maintain uplink synchronization between the terminal device and the base station device at a source working frequency point before spectrum switching;

a determining module 22, configured to determine whether uplink synchronization is maintained between the terminal device and the base station device after a target working frequency point is searched;

a first sending module 23, configured to send an uplink resource application to the base station device by using a sending method and resources of the uplink resource application when the determination result is yes, where the uplink resource application is used to apply for an uplink resource, and the uplink resource is used to enable the terminal device to send a spectrum handover completion message;

a receiving module 24, configured to receive, at a target working frequency point, an uplink resource allocated to the terminal device by the base station device at the target working frequency point;

a second sending module 25, configured to send, to the base station device by using the uplink resource, a spectrum handover complete message used for indicating that the terminal device has successfully completed a spectrum handover process.

The receiving module 24 is further configured to receive, at a target working frequency point, an uplink sending mode allocated by the base station device to the terminal device at the target working frequency point;

the second sending module 25 is further configured to send a spectrum handover complete message to the base station device by using the uplink resource and the uplink sending mode.

The determining module 22 is specifically configured to determine whether a time length between a current time or a time when the terminal device sends an uplink resource application and a time when the uplink timing synchronization point adjustment is performed last time does not exceed a specified time threshold, and whether a center frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold; if so, determining that the uplink synchronization is maintained between the terminal equipment and the base station equipment; if not, determining that the uplink synchronization between the terminal equipment and the base station equipment is not maintained; or,

when an authorized user reappears on a source working frequency point or the channel quality of the source working frequency point is reduced, receiving a frequency spectrum switching command from the base station equipment, wherein the frequency spectrum switching command comprises target working frequency points and/or wireless resource configuration information and indication information of whether uplink synchronization is maintained between the base station equipment and the terminal equipment; and determining that the uplink synchronization is maintained or not maintained between the terminal equipment and the base station equipment by using the indication information carried in the frequency spectrum switching command.

The management module 21 is further configured to obtain a sending method and resources of the uplink resource application in the following manner: before spectrum switching, presetting a sending mode and resources of an uplink resource application with the base station equipment; or when the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, receiving a spectrum switching command from the base station equipment, wherein the spectrum switching command comprises the target working frequency point and/or the wireless resource configuration information, and the sending mode and the resource of the uplink resource application.

The management module 21 is further configured to statically specify, with the base station device, a sending method and resources of the uplink resource application through a protocol; or,

and receiving a sending mode and resources of an uplink resource application from the base station equipment, wherein the sending mode and resources of the uplink resource application are configured for the terminal equipment by the base station equipment.

The management module 21 is further configured to agree in advance with the base station device about a maximum number of times of sending an uplink resource application;

the first sending module 23 is specifically configured to send an uplink resource application to the base station device multiple times by using a sending method and resources of the uplink resource application until the terminal device receives the uplink resource allocated to the terminal device by the base station device on a target working frequency point or the maximum sending times is reached.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.

Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. A frequency spectrum switching method based on a cognitive radio system is characterized in that before frequency spectrum switching, base station equipment and terminal equipment maintain uplink synchronization on a source working frequency point; the method comprises the following steps:

2. The method of claim 1, wherein the method further comprises:

and the base station equipment allocates an uplink transmission mode for the terminal equipment on the target working frequency point and transmits the allocated uplink transmission mode to the terminal equipment on the target working frequency point.

3. The method of claim 1, wherein the method further comprises:

before the frequency spectrum is switched, the base station equipment and the terminal equipment agree in advance on a sending mode and resources of an uplink resource application.

4. The method as claimed in claim 3, wherein the pre-agreeing, by the base station device and the terminal device, on the transmission mode and resource of the uplink resource application comprises:

the base station equipment and the terminal equipment statically stipulate the sending mode and the resource of the uplink resource application through a protocol; or,

and the base station equipment configures the sending mode and the resource of the uplink resource application for the terminal equipment and informs the sending mode and the resource of the uplink resource application to the terminal equipment.

5. The method of claim 1, wherein the method further comprises:

when the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, the base station equipment generates a frequency spectrum switching command and sends the frequency spectrum switching command to the terminal equipment; the frequency spectrum switching command comprises a target working frequency point and/or wireless resource configuration information, and a sending mode and resources of the uplink resource application.

6. The method according to any one of claims 3 to 5, wherein in a Long Term Evolution (LTE) system, the sending mode of the uplink resource application is specifically: and the base station equipment sends the uplink resource application through a scheduling request SR.

7. The method of claim 1, wherein the method further comprises:

when the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, the base station equipment generates a frequency spectrum switching command and sends the frequency spectrum switching command to the terminal equipment; the frequency spectrum switching command comprises target working frequency points and/or wireless resource configuration information and indication information of whether uplink synchronization is maintained between the base station equipment and the terminal equipment.

8. The method of claim 7, wherein the determining whether uplink synchronization is maintained between the base station device and the terminal device comprises:

the base station equipment judges whether the time length between the time when the terminal equipment sends the uplink resource application and the time when the timing adjustment command is sent for the last time does not exceed a specified time threshold or not, and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold or not; if so, the base station equipment determines that the uplink synchronization is maintained between the base station equipment and the terminal equipment; and if not, the base station equipment determines that the uplink synchronization between the base station equipment and the terminal equipment is not maintained.

9. A frequency spectrum switching method based on a cognitive radio system is characterized in that before frequency spectrum switching, a terminal device and a base station device maintain uplink synchronization on a source working frequency point; the method comprises the following steps:

10. The method of claim 9, wherein the method further comprises:

and the terminal equipment receives the uplink sending mode distributed for the terminal equipment by the base station equipment on the target working frequency point, and sends a frequency spectrum switching completion message to the base station equipment by utilizing the uplink resource and the uplink sending mode.

11. The method of claim 9, wherein the determining, by the terminal device, whether uplink synchronization is maintained between the terminal device and the base station device comprises:

the terminal equipment judges whether the time length between the current time or the time when the terminal equipment sends the uplink resource application and the time when the terminal equipment carries out uplink timing synchronization point adjustment for the latest time does not exceed a specified time threshold, and whether the central frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold; if so, the terminal equipment determines that the uplink synchronization is maintained between the terminal equipment and the base station equipment; if not, the terminal equipment determines that uplink synchronization is not maintained between the terminal equipment and the base station equipment; or,

when an authorized user reappears on a source working frequency point or the channel quality of the source working frequency point is reduced, the terminal equipment receives a frequency spectrum switching command from the base station equipment, wherein the frequency spectrum switching command comprises target working frequency points and/or wireless resource configuration information and indication information of whether uplink synchronization is maintained between the base station equipment and the terminal equipment; and the terminal equipment determines that the uplink synchronization is maintained or not maintained between the terminal equipment and the base station equipment by using the indication information carried in the frequency spectrum switching command.

12. The method of claim 9, wherein the sending of the uplink resource request and the obtaining of the resource comprise:

before the frequency spectrum is switched, the terminal equipment and the base station equipment agree in advance on a sending mode and resources of an uplink resource application; or,

when the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, the terminal equipment receives a frequency spectrum switching command from the base station equipment, wherein the frequency spectrum switching command comprises a target working frequency point and/or wireless resource configuration information, and a sending mode and resources of an uplink resource application.

13. The method as claimed in claim 12, wherein the step of the terminal device and the base station device pre-agreeing on the transmission mode and resource of the uplink resource application comprises:

the terminal equipment and the base station equipment statically stipulate the sending mode and the resource of the uplink resource application through a protocol; or,

and the terminal equipment receives the sending mode and the resource of the uplink resource application from the base station equipment, and the sending mode and the resource of the uplink resource application are configured for the terminal equipment by the base station equipment.

14. The method of claim 12, wherein the method further comprises: the terminal equipment and the base station equipment agree in advance on the maximum sending times of uplink resource application;

the method for the terminal equipment to send the uplink resource application to the base station equipment by using the sending mode and the resource of the uplink resource application comprises the following steps: and the terminal equipment sends the uplink resource application to the base station equipment for multiple times by using the sending mode and the resource of the uplink resource application until the terminal equipment receives the uplink resource distributed for the terminal equipment by the base station equipment on the target working frequency point or the maximum sending times is reached.

15. A base station apparatus, comprising:

16. The base station apparatus of claim 15,

the distribution module is also used for distributing an uplink transmission mode for the terminal equipment on a target working frequency point;

and the sending module is further configured to send the allocated uplink sending mode to the terminal device on a target working frequency point.

17. The base station apparatus of claim 15,

the management module is further configured to pre-agree with the terminal device about a sending method and resources of the uplink resource application before spectrum switching.

18. The base station apparatus of claim 17,

the management module is further configured to statically specify, with the terminal device, a sending method and resources of the uplink resource application through a protocol; or configuring the sending mode and the resource of the uplink resource application for the terminal equipment, and informing the sending mode and the resource of the uplink resource application to the terminal equipment.

19. The base station apparatus of claim 15,

the management module is further configured to generate a spectrum switching command when an authorized user reappears at the source working frequency point or the channel quality of the source working frequency point is reduced, and send the spectrum switching command to the terminal device; the frequency spectrum switching command comprises a target working frequency point and/or wireless resource configuration information, and a sending mode and resources of the uplink resource application.

20. The base station device of any one of claims 17 to 19, wherein in a long term evolution LTE system, the sending manner of the uplink resource application specifically is: and sending the uplink resource application through a scheduling request SR.

21. The base station apparatus of claim 15,

the management module is further configured to generate a spectrum switching command when an authorized user reappears at the source working frequency point or the channel quality of the source working frequency point is reduced, and send the spectrum switching command to the terminal device; the frequency spectrum switching command comprises target working frequency points and/or wireless resource configuration information and indication information of whether uplink synchronization is maintained between the base station equipment and the terminal equipment.

22. The base station apparatus of claim 21,

the management module is further configured to determine whether uplink synchronization is maintained between the base station device and the terminal device by: judging whether the time length between the time when the terminal equipment sends the uplink resource application and the time when the terminal equipment sends the timing adjustment command for the last time does not exceed a specified time threshold or not, and whether the central frequency interval between the target working frequency point and the source working frequency point does not exceed a specified frequency threshold or not; if so, determining that the uplink synchronization is maintained between the base station equipment and the terminal equipment; and if not, determining that the uplink synchronization between the base station equipment and the terminal equipment is not maintained.

23. A terminal device, comprising:

24. The terminal device of claim 23,

the receiving module is further configured to receive, at a target working frequency point, an uplink sending mode allocated to the terminal device by the base station device at the target working frequency point;

the second sending module is further configured to send a spectrum handover completion message to the base station device by using the uplink resource and the uplink sending mode.

25. The terminal device of claim 23,

the judging module is specifically configured to judge whether a time length between a current time or a time when the terminal device sends an uplink resource application and a time when uplink timing synchronization point adjustment is performed last time does not exceed a specified time threshold, and whether a center frequency interval between a target working frequency point and a source working frequency point does not exceed a specified frequency threshold; if so, determining that the uplink synchronization is maintained between the terminal equipment and the base station equipment; if not, determining that the uplink synchronization between the terminal equipment and the base station equipment is not maintained; or,

26. The terminal device of claim 23,

the management module is further configured to obtain a sending method and resources of the uplink resource application in the following manner: before spectrum switching, presetting a sending mode and resources of an uplink resource application with the base station equipment; or when the authorized user reappears on the source working frequency point or the channel quality of the source working frequency point is reduced, receiving a spectrum switching command from the base station equipment, wherein the spectrum switching command comprises the target working frequency point and/or the wireless resource configuration information, and the sending mode and the resource of the uplink resource application.

27. The terminal device of claim 26,

the management module is further configured to statically specify, with the base station device, a sending method and resources of the uplink resource application through a protocol; or,

28. The terminal device of claim 26,

the management module is further configured to agree in advance with the base station device about a maximum number of times of sending an uplink resource application;

the first sending module is specifically configured to send the uplink resource application to the base station device multiple times by using a sending mode and resources of the uplink resource application until the terminal device receives the uplink resources allocated to the terminal device by the base station device on a target working frequency point or the maximum sending times is reached.